how to make a tachometer

• 2022-04-19

Tachometer is one of the necessary instruments in the machinery industry. It is often used to measure the speed, linear speed or frequency of motor. It is often used in manufacturing industries such as motor, electric fan, aircraft and ship. The existing tachometer generally adopts the traditional magnetoelectric meter, but this kind of tachometer is easy to be damaged and the measurement accuracy is low.

The purpose of the utility model is to overcome the above shortcomings and provide a tachometer with simple manufacture, intuitive and reliable observation. The purpose of the utility model is to realize a tachometer through the following technical scheme, which comprises a shell component, the shell component is a hollow structure, the front of the shell component is connected with a front cover, the front surface of the front cover is provided with glass, a mounting piece is arranged through the rear wall of the shell component, one end of the mounting piece located inside the shell component is connected with a stepping motor, and the front of the stepping motor is connected with a circuit board through a first screw, The front of the circuit board is connected with a dial tray through a second screw, the front of the dial tray is provided with a dial, the dial is connected with a pointer component, the pointer component includes a pointer cap, a pointer body and a connecting shaft, the rear of the pointer body is connected with the connecting shaft, the connecting shaft is connected with the circuit board through the dial and the dial tray, the pointer cap and the pointer body are placed in the front of the dial, and the rear of the circuit board is connected with the circuit board.

It's suitable for suckers to make their own or transfigure old instruments. The circuit only uses two integrated circuits. CD4069 is used for small signal modification and shaping, and AT90S2313 is a high- speed single chip microcomputer with simplified instructions, Its performance under 8m timepiece exceeds that of 51 series under 100m timepiece. It acts as dimension, operation and display motorist in the circuit. Utmost digital display frequence measures use a" alternate gate"to count, so the dimension error increases at low frequence and the numeric can not be displayed. Still, this circuit adopts the binary dimension technology of palpitation range and viscosity, supplemented by high- speed floating- point operation, so the dimension delicacy is high, and it can automatically change the range and display the numeric. For illustration, the dimension result may be0.543261.4,etc. use it to measure the AC frequence. You can see that the result generally changes sluggishly between49.82-50.17. Thus, this circuit is veritably suitable to be installed in the creator and distribution room for AC frequence display.